/Engine/Plugins/Editor/UVEditor/Source/UVEditor/Public/UVEditor3DViewportClient.h
Viewport client for the 3d live preview in the UV editor. Currently same as editor viewport client but doesn't allow editor gizmos/widgets, and alters orbit camera control.
class FUVEditor3DViewportClient : public [FEditorViewportClient](API\Editor\UnrealEd\FEditorViewportClient)
EUVEditor3DView...
CameraMode
Enforce Orbit camera for UV editor live preview viewport.
UUVToolViewport...
ViewportButtonsAPI